Tire-pressure gage



W. Au ALLENi TERE `PRESSURE GAGE. M'PLscATioN mio MAR. a, 19H. www SEPT. la. |919.

Patented Mar. s. 1921A WILLIAM A. ALLEN, or roNxnns, NEW vomi, AssieNonro .gscnnannn's soN, INCORPORATED, or NEW Yeux, N. Y.; A conPonArIoN or NEW roms Tins-PRESSURE caen.

Speciicavtion of Letters Patent. A 'Patented Mal'. 8, 1921- Application filed VIliarch 3, 19141, Serial No. 612,007.' Renewed September 18, 1919. Serial No. 324,574.

To all whom 'it (may concern Be it known that I, WILLIAM A. ALLEN,

a citizen of the United States'of America, residing in the cityv of Yonkers, in the county j of Westchester, in the State of New York, have invented certain newv and useful Improvements in Tire-Pressure Gages, of

which the followinV is aspecification.

My invention lre ates to pressure gages, more particularly such as are intended .for testingI air pressure in the pneumatic tires of automobile Wheels and the like, andthe object of my invention Vis to provide a suit! able indicating device therefor, particularly one which Vwill move Voutwardly with the pressure piston and remain in indicating po-V sition while the piston returns to normal posit-ion, y

In the accompanying drawing- Ffure 1 is a side` elevationof aV gage to vhich my invention has been vapplied in one orm;

Fig. 2 is a vertical section thereof; and

F ig. 3` is a perspective of the indicating band or ring.

As shown, the gage comprises an outer tubular case A, the internal tubular piston B, and the helical pull spring D,\connecting the upper closed end of the piston Bwith thev lower end of the outer case A. As a convenient means of connecting the ends of the spring to these parts, I provide a cross-pin d passing through a transverse opening in the piston head band a loop at the correspondin end of the spring, while a pin d1 passes through a loop at the other cnd of the spring and bears against the lower end of the case A, Fig. 2. A ferrule a screwed onto the lower end of the case A carrying a nipple plate E helps to hold the pin d1 in place. The nipple part e of the plate E has an opening e1 for the admission of air to the inner or underside o' the piston, when -on application of the device to the tire nip` incluse the latterin all its positions and its Nuplpcr end is closedy by a cap al.

fly improved indicating device comprises a.. gage member slldable on the exterior lof the casmgandhaving ay portion adapted-to f b'e engaged bythe piston. when the latter 1s moved outwardly,tl1e piston being adapted to return to normal position independently of said member. In the form' shown, tins .member comprises a spring clip or sleeve SV winch slides over the graduations 'X on thev exterior of the casing-A. Rigid UNITED STATES PATE-NTj0FFIcE- that as the latter moves outwardly the lug 1 s o'n the clip S is engaved thereby and the sleevecorrespondingly c is'placed. Upon'the removal of the gage from the tire valve the piston at once sinks, but therclip S, by reason of its rictional engagement with the exterior of the casing,remainsin the position von the scale X to whirh it has been forced out bythe piston. The tire pressure may thus be read at leisure or in a. more convenient spot than that at which it may have been necessary to apply the vage. After the record has been noted, the ctlip S may be moved down to normal position by simply sliding it down over `the casing until the luc' s impinges against the bottom of `the slot T 1n the casing.

.I do not herein 'claim broadly a neumatic tire gage'having a means of quier application to a tire valve andan indicator which remains in its indicating position byfriction or otherwise after the gage is removed from the tire valve, since this is the invention of others.

Obviously my-invention may be embodied in other forms of construction than that illustrated, and I do not limit myself thereto, but claimsov 1. A gage for pneumatic tires comprising rule at the tire-valve-engaging end of said casing, a tubular piston within said casing, a helical-spring attached at one end to said piston, and a pin vfastened between the end of 'said casing and saidseparable parts to which the other end of seid spring is attached.

3. A ressure gage for pneumatic tires comprising u single casing having a longitudinal slot therein for a portion of its length, a springresisted tubular piston within said casing, said piston having a packing means at its lower end, said piston being adapted to move into that part of the casing having the longitudinal slot, thc packing means of the piston maintaininpr a tight connection with the unslotted part of the casing, and a spring, said s ring being" inside of the tubular piston, anc an indicator rictionally mounted on the outer portion of the casing said indicator being disconnected from the piston and having means projectin through the longitudinal slot in the cylinr er whereby said indicator may be actuated by the movements of the tubular piston and left in registerinfY position when the piston is withdrawn by the action of the spring.

4. A. gage for pneumatic tires comprising n. tubular casing, said casing having u portion with closed walls and a portion with an opening therein, a. tubular piston arranged within the casing, and having the upper end closed and adapted to extend within said portion of the casing provided with said opening upon pressure being exerted against its pressure face, said closed portion of the casing ser'vingbas a cylinder for said piston, and a spring einp; normally housed within said tu ular piston, said opening serving for the purpose of determining the position of said piston within said casing.

5. A gave for pneumatic tires comprising a tubu ar casing, said casing having a portion with closed walls and a portion with an opening therein, a tubular piston arranged within the casing, and having the upper end closed and adapted to extend within said portion of the casing provided with said opening upon pressure being exerted aga-inst its pressure face, seid closed portion of the casing serving1r as a cylinder 'for said piston, and a spring being normallj7 housed within said tubular piston, said opening serving for the purpose of determining the position of said piston within said casing, and said piston having a packinpr at its lower end.`

In testimony whereof I have signed my name t0 this specification, in the presence of two subscribing witnesses.

WILLIAM A. ALLEN.

Witnesses:

GEORGE A. OVENS, E, Gnmmmo. 

